Linear Electrical Networks
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. NONLINEAR ELECTRICAL NETWORKS SIMULATION / SIMULAÇÃO DE REDES ELÉTRICAS CONTENDO NÃO-LINEARIDADES
As simulações de redes elétricas são atualmente fundamentais para o setor elétrico. Uma de suas principais utilidades é permitir a análise de falhas e ocorrências, que eventualmente passariam despercebidas. Existe atualmente, uma grande variedade de algoritmos para realizar simulações de redes lineares, que correspondem à grande maioria dos testes
Publicado em: 2009
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2. Integração dos processos de eletrodiálise e de degradação fotoquímica para o tratamento de efluentes salinos contendo fenol. / Integration of electrodialysis and photochemical degradation process for the treatment of a saline wastewater containing phenol.
Chemical oxidation processes can be used to treat industrial wastewater containing non-biodegradable organic compounds. However, the presence of dissolved salts may inhibit or retard the treatment process. In this work, a coupled process is studied including a desalination step by electrodialysis (ED) associated with an advanced oxidation process (photo-Fent
Publicado em: 2009
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3. Otimização dos custos de energia elétrica na programação do armazenamento e distribuição de água em redes urbanas / Minimization of the electrical energy cost in water distribution networks
The problem focused in this study consists of reducing the eletrical energy cost necessary to the operation of hydraulic pumps. The hydraulic pumps are used to catch water from artesians wells or Water Treatment Station to supply tanks which are located in districts in a city, from which the population will be supplied by gravitational force. As the cost of
Publicado em: 2008
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4. Development of a system for monitoring gait variables and controlling FES on gait / Desenvolvimento de um sistema para monitoramento de variáveis da marcha e controle de EENM na marcha
A lesão medular pode prejudicar a marcha de um indivíduo. Para estes casos, uma técnica de reabilitação que tem se tornado mais popular é a Estimulação Elétrica Neuro Muscular (EENM). Na marcha assistida por EENM tradicional, o controle da estimulação é realizado utilizando-se acionamento manual, um fato que ajuda a torná-la distante da marcha s
Publicado em: 2008
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5. Determinação do conteúdo harmônico de corrente baseada em redes neurais artificiais para cargas não-lineares monofásicas / Determination of the current harmonic content based on artificial neural networks for single-phase non-linear loads
In this thesis artificial neural networks are employed in a novel approach to identifying harmonic components of the single-phase nonlinear load current, whose amplitudes and phase angles are subject to unpredictable changes in steady-state. An identified harmonics number is previously selected. These harmonics are present in the non-linear loads current of
Publicado em: 2007
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6. Fault diagnosis in a rotor supported by active magnetic bearings / Detecção de falhas em rotores sustentados por mancais magneticos ativos
This work applies the methodology of fault diagnosis in rotating machinery supported by active magnetic bearings and active con1rol systems, excited by unbalance and white noise. This diagnostic applies the correlation matrices based on the Ljapunov matrix formulation and artificial neural network for linear stationary systems. The procedure uses only measur
Publicado em: 2006
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7. CHARACTERISATION OF ALLOPTICAL WAVELENGTH CONVERSION BY CROSS-GAIN MODULATION IN SEMICONDUCTOR OPTICAL AMPLIFIERS / CARACTERIZAÇÃO DA CONVERSÃO DE COMPRIMENTO DE ONDA POR MODULAÇÃO DE GANHO CRUZADO EM AMPLIFICADORES ÓPTICOS SEMICONDUTORES
Wavelength conversion of optical signals by all-optical techniques is an innovative and necessary technology for wavelength routed networks in the near future; the cross-gain modulation method is one of the simplest, in form, to attain this goal. Two categories of the main technique are presented: the classic, also known as pump and probe, and a novel one, n
Publicado em: 2005
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8. ROTEAMENTO E ALOCAÇÃO DE COMPRIMENTO DE ONDA EM REDES ÓPTICAS / ROUTING AND WAVELENGTH ASSIGNMENT IN OPTICAL NETWORKS.
The communication industry was passing in lastest years by great transformations in world. Internet is the mainly responsable for that, because there is the necessity of a large band to data transmission. The optical networks concept and wavelength division multiplexing technology were arised in order to solve this problem. However, this created another prob
Publicado em: 2003
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9. SIMULAÇÃO EFICIENTE DO SISTEMA ELÉTRICO DE POTÊNCIA UTILIZANDO FILTRAGEM DIGITAL MULTITAXA / EFFICIENT SIMULATION OF THE ELECTRIC POWER SYSTEM USING MULTIRATE DIGITAL FILTERING
Esta pesquisa propõe a implementação de um simulador para investigar o comportamento dinâmico dos sistemas elétricos de potência e a sua estabilidade. É introduzida uma nova abordagem para simulação de redes elétricas lineares, que segue as técnicas básicas e os modelos utilizados no EMTP (simulador tradicional), porém levando vantagem ao utiliz
Publicado em: 2002
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10. SIMULAÇÃO DIGITAL NO TEMPO DE REDES ELÉTRICAS LINEARES EXCITADAS POR SENÓIDES NO ENTORNO DE UMA FREQÜÊNCIA / TIME DOMAIN DIGITAL SIMULATION OF LINEAR ELECTRICAL NETWORKS EXCITED BY SINUSOIDAL INPUT IN THE NEIGHBORHOOD OF A FREQUENCY
The simulation of linear systems with sinusoidal input has a very simple solution by transform methods. However, when the network is of large scale and the frequency of excitation is unknown, this fasorial analysis method is not satisfactory because of its complexity. Several processes of computer analysis have been developed recently addressing the problem
Publicado em: 1999
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11. Conservação de energia eletrica em sistemas publicos de abastecimento de agua : otimização operacional da rede de Macapa
This work presents a modeI to optirnize the daily operational strategy of pumping in water supply systems with the objective of minirnizing the electrical energy use and cost. The modeI performs spatial and temporal analyses on the system to optirnizethe pumps switching, considering a daily horizon of programming with discrete intervals of three hours. The o
Publicado em: 1999
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12. Contribuições a tecnica de "Feedforward" em amplificadores banda larga de potencia em microondas
The basic aim of the present work was to extend the application limits of the feedforward technique to microwave amplifiers, mainly for multi-octave operation. It has been shown that it is possible to make use of feedforward linearization for broadband networks (such as CATV) and optical communication circuits as well. For the sake of completeness, this work
Publicado em: 1996